US 5,629,711 AGranted

Window glass antenna device

AssigneeNippon Sheet Glass Co., Ltd.

InventorsYoshinori Matsuoka, Harunori Murakami

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Abstract

A window glass antenna device defrosting heaters for use as part of a reception antenna on an automobile window glass panel. The defrosting heaters include at least first and second heaters each comprising a plurality of heater wires disposed on the window glass panel, a first bus bar interconnecting ends of the heater wires, and a second bus bar interconnecting opposite ends of the heater wires. A first choke coil is connected between the first bus bars of the first and second heaters and a battery, and disposed near the first bus bars, and a second choke coil is connected between the second bus bars of the first and second heaters and the battery, and disposed near the second bus bars. The first choke coil has at least two windings disposed around a core, the windings being connected respectively to the first bus bars of the first and second heaters such that magnetic fluxes generated in the core by a first electric current flowing through the first heater and a second electric current flowing through the second heater will be canceled. The second choke coil has at least two windings disposed around a core, the last-mentioned windings being connected respectively to the second bus bars of the first and second heaters such that magnetic fluxes generated in the core by the first electric current flowing through the first heater and the second electric current flowing through the second heater will be canceled.

Claims10

Dependent claims

A window glass antenna device comprising:

a window glass panel;
defrosting heaters for use as part of a reception antenna, said defrosting heaters including at least first and second heaters each comprising a plurality of heater wires disposed on said window glass panel, first bus bars interconnecting ends of said heater wires, and second bus bars interconnecting opposite ends of said heater wires;
current supply means for supplying electric currents to said defrosting heaters;
a first choke coil connected between the first bus bars of said first and second heaters and said current supply means;
and
a second choke coil connected between the second bus bars of said first and second heaters and said current supply means;
said first choke coil having a core and at least two windings disposed around said core, said windings being connected respectively to the first bus bars of said first and second heaters such that magnetic fluxes generated in said core by a first electric current flowing through said first heater and a second electric current flowing through said second heater will be canceled;
said second choke coil having a core and at least two windings disposed around said core, said windings being connected respectively to the second bus bars of said first and second heaters such that magnetic fluxes generated in said core by said first electric current flowing through said first heater and said second electric current flowing through said second heater will be canceled;
and
at least one of said first and second choke coils including a third winding disposed around said core, and current adjusting means for supplying an electric current from said current supply means to said third winding for producing a magnetic flux to cancel any magnetic flux produced by the difference between electric currents flowing through said two windings of said at least one of said first and second choke coil.

7 more elements

Dependencies are inferred from the claim text.